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annotate mpffs/xtr.c @ 40:7ceab8bfacb3

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mpffs-cat and mpffs-xtr converted to use the new extra chunk handling
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Mon, 01 Jul 2013 07:04:01 +0000
parents 390be89892c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
36
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
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2 * This module contains the main function and other code specific to mpffs-xtr
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/file.h>
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7 #include <ctype.h>
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8 #include <stdio.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <stdlib.h>
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12 #include <unistd.h>
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13 #include "types.h"
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14 #include "struct.h"
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15
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16 extern char *imgfile;
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17 extern struct objinfo root;
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18 extern int verbose;
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19
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20 extern u8 *find_end_of_chunk();
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21
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22 char workpath[512];
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23
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24 name_safe_for_extract(oi)
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25 struct objinfo *oi;
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26 {
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27 char *s;
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28
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29 s = (char *)oi->dataptr;
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30 if (!isalnum(*s) && *s != '_')
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31 return(0);
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32 for (s++; *s; s++)
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33 if (!isalnum(*s) && *s != '_' && *s != '.')
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34 return(0);
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35 return(1);
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36 }
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37
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38 void
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39 dump_head_chunk(fd, ch)
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40 struct objinfo *ch;
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41 {
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42 u8 *endname, *endchunk;
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43
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44 endname = (u8 *) index((char *)ch->dataptr, '\0') + 1;
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45 endchunk = find_end_of_chunk(ch);
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46 if (endchunk <= endname)
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47 return;
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48 write(fd, endname, endchunk - endname);
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49 }
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50
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51 void
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52 dump_extra_chunk(ch, opaque)
36
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53 struct objinfo *ch;
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54 u_long opaque;
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55 {
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56 int fd = (int) opaque;
36
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57 u8 *endchunk;
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58
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59 endchunk = find_end_of_chunk(ch);
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60 write(fd, ch->dataptr, endchunk - ch->dataptr);
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61 }
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62
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63 extract_file(head)
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64 struct objinfo *head;
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65 {
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66 int fd;
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67
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68 fd = open(workpath + 1, O_WRONLY|O_CREAT|O_TRUNC, 0666);
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69 if (fd < 0) {
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70 perror(workpath + 1);
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71 exit(1);
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72 }
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73 dump_head_chunk(fd, head);
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74 iterate_extra_chunks(head->descend, dump_extra_chunk, (u_long) fd);
36
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75 close(fd);
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76 }
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77
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78 dump_dir(firstent, path_prefix)
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79 {
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80 int ent;
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81 struct objinfo obj;
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82
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83 for (ent = firstent; ent != 0xFFFF; ent = obj.sibling) {
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84 obj.entryno = ent;
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85 get_index_entry(&obj);
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86 if (!obj.type) /* skip deleted objects w/o further validation */
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87 continue;
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88 validate_chunk(&obj);
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89 validate_obj_name(&obj);
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90 if (path_prefix + strlen(obj.dataptr) + 2 > sizeof workpath) {
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91 fprintf(stderr,
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92 "handling object at index %x, name \"%s\": path buffer overflow\n",
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93 obj.entryno, (char *)obj.dataptr);
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94 exit(1);
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95 }
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96 sprintf(workpath + path_prefix, "/%s", (char *)obj.dataptr);
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97 switch (obj.type) {
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98 case 0xF2:
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99 /* directory */
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100 if (verbose)
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101 printf("dir: %s\n", workpath);
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102 if (!name_safe_for_extract(&obj)) {
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103 fprintf(stderr,
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104 "warning: directory name contains unsafe characters; subtree skipped\n");
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105 continue;
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106 }
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107 if (mkdir(workpath + 1, 0777) < 0) {
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108 perror(workpath + 1);
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109 exit(1);
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110 }
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111 dump_dir(obj.descend, strlen(workpath));
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112 continue;
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113 case 0xF1:
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114 /* regular file */
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115 if (verbose)
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116 printf("file: %s\n", workpath);
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117 if (!name_safe_for_extract(&obj)) {
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118 fprintf(stderr,
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119 "warning: file name contains unsafe characters; file skipped\n");
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120 continue;
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121 }
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122 extract_file(&obj);
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123 continue;
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124 case 0xE1:
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125 /* special .journal file */
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126 if (verbose)
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127 printf("skipping E1 file: %s\n", workpath);
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128 continue;
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129 default:
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130 fprintf(stderr,
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131 "warning: %s (index entry #%x): unexpected type %02X; skipping\n",
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132 workpath, obj.entryno, obj.type);
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133 continue;
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134 }
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135 }
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136 }
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137
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138 usage()
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139 {
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140 fprintf(stderr, "usage: mpffs-xtr [options] ffs-image destdir\n");
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141 exit(1);
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142 }
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143
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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144 main(argc, argv)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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145 char **argv;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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146 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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147 extern int optind;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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148
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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149 parse_cmdline_options(argc, argv);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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150 if (argc - optind != 2)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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151 usage();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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152 imgfile = argv[optind];
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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153 preliminaries();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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154 if (chdir(argv[optind+1]) < 0) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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155 perror(argv[optind+1]);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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156 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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157 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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158 dump_dir(root.descend, 0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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159 exit(0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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160 }